Rail crossing warning sign



FIG. 1 illustrates a first embodiment of the traffic warning sign of thepresent invention;

FIG. 2 illustrates a second embodiment thereof; and,

FIG. 3 illustrates a third embodiment thereof.

The unillustrated views are unornamented and thus form no part of theclaimed invention.

The ornamental design for a rail crossing warning sign, as shown anddescribed.